Continued brightening of the afterglow of gw170817/grb 170817a as being due to a delayed energy injection
文献类型：期刊论文
| 作者 | Li,Bing1,2,3; Li,Long-Biao1,4; Huang,Yong-Feng1,4; Geng,Jin-Jun1,4; Yu,Yong-Bo1,4; Song,Li-Ming2,3 |
| 刊名 | The astrophysical journal letters
 |
| 出版日期 | 2018-05-17 |
| 卷号 | 859期号:1 |
| ISSN号 | 2041-8205 |
| 关键词 | Accretion, accretion disks Gamma-ray burst: individual (grb 170817a) Methods: numerical Stars: neutron |
| DOI | 10.3847/2041-8213/aac2c5 |
| 英文摘要 | Abstract the brightness of the multi-wavelength afterglow of grb 170817a is increasing unexpectedly even ～160 days after the associated gravitational burst. here we suggest that the brightening can be caused by a late-time energy injection process. we use an empirical expression to mimic the evolution of the injection luminosity, which consists of a power-law rising phase and a power-law decreasing phase. it is found that the power-law indices of the two phases are 0.92 and ?2.8, respectively, with the peak time of the injection being ～110?days. the energy injection could be due to some kind of accretion, with the total accreted mass being ～0.006?m⊙. however, normal fall-back accretion, which usually lasts for a much shorter period, cannot provide a natural explanation. our best-fit decay index of ?2.8 is also at odds with the expected value of ?5/3 for normal fall-back accretion. noting that the expansion velocities of the kilonova components associated with gw170817 are 0.1–0.3 c, we argue that there should also be some ejecta with correspondingly lower velocities during the coalescence of the double neutron star (ns) system. they are bound by the gravitational well of the remnant central compact object and might be accreted at a timescale of about 100 days, providing a reasonable explanation for the energy injection. detailed studies on the long-lasting brightening of grb 170817a thus may provide useful information on matter ejection during the merger process of binary neutron stars. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:2041-8205-859-1-AAC2C5 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2175744 |
| 专题 | 高能物理研究所 |
| 作者单位 | 1.School of Astronomy and Space Science, Nanjing University, Nanjing 210023, People's Republic of China; hyf@nju.edu.cn, gengjinjun@nju.edu.cn 2.Key Laboratory for Particle Astrophysics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China 3.Particle Astrophysics Division, Institute of High Energy Physics, Chinese Academy of Sciences, People's Republic of China 4.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Li,Bing,Li,Long-Biao,Huang,Yong-Feng,et al. Continued brightening of the afterglow of gw170817/grb 170817a as being due to a delayed energy injection[J]. The astrophysical journal letters,2018,859(1). |
| APA | Li,Bing,Li,Long-Biao,Huang,Yong-Feng,Geng,Jin-Jun,Yu,Yong-Bo,&Song,Li-Ming.(2018).Continued brightening of the afterglow of gw170817/grb 170817a as being due to a delayed energy injection.The astrophysical journal letters,859(1). |
| MLA | Li,Bing,et al."Continued brightening of the afterglow of gw170817/grb 170817a as being due to a delayed energy injection".The astrophysical journal letters 859.1(2018). |
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